mb/starlabs/starbook/tgl: Configure PMC mux

Configure PMC mux in devicetree.

Tested on StarBook Mk V with Ubuntu 22.04.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I297d5446e43357d97357f345668cf40dcd28502d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68083
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/mainboard/starlabs/starbook/Kconfig

@@ -39,6 +39,7 @@ config BOARD_STARLABS_LABTOP_CML
 config BOARD_STARLABS_STARBOOK_TGL
 	select BOARD_ROMSIZE_KB_16384
 	select BOARD_STARLABS_STARBOOK_SERIES
+	select DRIVERS_INTEL_PMC
 	select DRIVERS_INTEL_USB4_RETIMER
 	select EC_STARLABS_KBL_LEVELS
 	select EC_STARLABS_MAX_CHARGE

src/mainboard/starlabs/starbook/variants/tgl/devicetree.cb

@@ -182,7 +182,17 @@ chip soc/intel/tigerlake
 			end
 		end
 		device ref p2sb		on  end
-		device ref pmc		hidden end
+		device ref pmc		hidden
+			chip drivers/intel/pmc_mux
+				device generic 0 on
+					chip drivers/intel/pmc_mux/conn
+						use usb2_port1 as usb2_port
+						use tcss_usb3_port1 as usb3_port
+						device generic 0 alias conn0 on end
+					end
+				end
+			end
+		end
 		device ref hda		on
 			register "PchHdaAudioLinkHdaEnable"	= "1"
 		end